PHP create 3D Array from Array with 3 Values

Question

again me:

following array;

$myArray = array('FOO', 'BAR', 'HELLO');

i need:

$myArray['FOO']['BAR']['HELLO'] = 0;

any ideas?

Community · Accepted Answer · 2017-05-23 12:08:38Z

14

 function onion($a) {
  return $a ? array(array_shift($a) => onion($a)) : 0;
}

$myArray = array('FOO', 'BAR', 'HELLO');
print_r(onion($myArray));

//edit: actually doc's solution is better, his/her code, a bit improved

  $new = 0;
  foreach (array_reverse($myArray) as $v)
       $new = array($v => $new);

edited May 23, 2017 at 12:08

CommunityBot

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answered Nov 12, 2009 at 14:53

user187291

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1 Comment

GSto Over a year ago

very nice, this is much cleaner than the implementation I wrote. ArneRie really sould accept this as being correct.

mip · Accepted Answer · 2009-11-12 14:56:38Z

2

$newarr[array_pop($myarr)] = 0;
foreach (array_reverse($myarr) as $v)
    $newarr[$v] = $newarr;

answered Nov 12, 2009 at 14:56

mip

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1 Comment

mip Over a year ago

Every recursive algorithm has non-recursive equivalent ;)

Myles · Accepted Answer · 2009-11-12 14:43:26Z

1

You might try $newArray[$myArray[0]][$myArray[1]][$myArray[2]] = 0;

answered Nov 12, 2009 at 14:43

Myles

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Comments

erenon · Accepted Answer · 2009-11-12 14:44:17Z

1

$newArray = array($oldArray[0] => array($oldArray[1] => array($oldArray[2] => 0)));

answered Nov 12, 2009 at 14:44

erenon

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1 Comment

opHasNoName Over a year ago

sure but i need to create it "automatic" i dont know how many keys or values in my source.. (-:

GSto · Accepted Answer · 2009-11-12 14:56:33Z

1

you could do it with recursion:

function arrToKeys(&$arr,$initialCount){
   if($initialCount == 0 ){
      return $arr;
   }
   else{
      $newKey = $arr[0];
      unset($arr[0]);
      $arr[$newKey] = $arr;
      $initialCount--;
      return arrToKeys($arr,$initialCount);  
   }
}

//then call it like this
$newArr = arrToKeys($myArray,count($myArray));

edited Nov 12, 2009 at 14:56

answered Nov 12, 2009 at 14:48

GSto

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1 Comment

Andrei Serdeliuc ॐ Over a year ago

That function throws a segmentation fault. And you're missing a closing bracket

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